Hello, I want to play a scenario (ND 4) with a party of player character. (Number : 4)
Objective : Obtain the oil from the scalathrax.
Before the scalathrax, there is an encounter with ghouls. (Number : 2-3-4 ?)
Near the fighting, there is a fort with a priestess.
In the Underdark, there will be the encounter with scalatrax. (Number : 2-3-4 ?)
Place : a cave without light and narrows corridor for the other issues. In the cave, there is a water point.
0 : The scalathrax climbed the ceiling at 15 feet above the ground. (Stealth check and then Perception checks of the PCs against DC Stealth)
Or :
To determine whether someone is undetected by other participants in the encounter, you still compare their Stealth check for initiative to the Perception DC of their enemies. They’re undetected by anyone whose DC they meet or exceed. So what do you do if someone rolls better than everyone else on initiative, but all their foes beat their Perception DC? Well, all the enemies are undetected, but not unnoticed.
Flat footed for the PCs if undetected.
1st round : leg quill vs PCs and then spray toxic oil (1d4 rounds to use again spray toxic oil)
After the attacks, the PCs must seek to find the scalathrax ?
2nd round : leg quill or move and jaws.
....
The scalathrax have a fire weakness. Against fire persistent damage, the scalathrax must a check recovery DC 15 at the end of the each turn, is it right ?
If a scalathrax use the assisted recovery with 2 actions, it can make an immediate recovery check, is it right ?
If a scalathrax will go in the water point, dousing it on water to put of flames, DC is 10, is it right ?
Aquatic combat :
You’re flat-footed unless you have a swim Speed.
You gain resistance 5 to acid and fire.
You take a –2 circumstance penalty to melee slashing or bludgeoning attacks that pass through water.
If a scalathrax is in water, it obtains resistance 5 to acid and fire but is flat-footed, is it right ?
Thanks for your future answer.
Flat footed for the PCs if undetected.
Yes. If the enemy is hidden or undetected, then the party is flat-footed to its first attack. Once it does something other than hide, step, or sneak it will no longer be hidden.
The scalathrax have a fire weakness. Against fire persistent damage, the scalathrax must a check recovery DC 15 at the end of the each turn, is it right ?
Yes. At the end of their turn after taking the persistent damage, the target gets a free DC 15 check to recover and remove the persistent damage.
If a scalathrax use the assisted recovery with 2 actions, it can make an immediate recovery check, is it right ?
Assisted Recovery does give you an immediate check to remove the persistent damage.
And it normally takes 2 actions to do - though there may be circumstances where the GM can change that.
If a scalathrax will go in the water point, dousing it on water to put of flames, DC is 10, is it right ?
Assisted Recovery does normally reduce the DC to 10 - but certain things such as full immersion in water against persistent fire or acid, the GM may simply rule that it automatically removes the persistent damage.
It is not specified if that change to DC 10 is permanent or only for the immediate check. I have seen it run both ways - both where the DC changes to 10 for the immediate check and for all future checks against that persistent damage, and where the immediate check is DC 10, but if that fails then the automatic check at the end of the round is DC 15 again.
Aquatic combat :
If a scalathrax is in water, it obtains resistance 5 to acid and fire but is flat-footed, is it right ?You’re flat-footed unless you have a swim Speed.
You gain resistance 5 to acid and fire.
You take a –2 circumstance penalty to melee slashing or bludgeoning attacks that pass through water.
That looks correct, yes. As long as they are immersed enough that they need to be swimming and they are at least mostly submerged in the water.
If it is a shallow pool, I would instead treat it as difficult terrain or even greater difficult terrain. It wouldn't give the resistances, but also wouldn't cause flat-footed.
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1st round : leg quill vs PCs and then spray toxic oil (1d4 rounds to use again spray toxic oil)
After the attacks, the PCs must seek to find the scalathrax ?
Look up the Hide Action:
"If you successfully become hidden to a creature but then cease to have cover or greater cover against it or be concealed from it, you become observed again."
This means if the PCs get the creature into Bright Light, it will automatically become Observed, which is likely since they will probably bring some sort of light source with them.
"You cease being hidden if you do anything except Hide, Sneak, or Step."
As soon as it uses its leg quill Strike, it will become Observed (Or hidden if it's still in total darkness and they don't have darkvision)
"If you attempt to Strike a creature, the creature remains flat-footed against that attack, and you then become observed."
This means the PCs will be flat-footed against the leg quill Strike, but after you follow the rules above (It's observed now unless still in total darkness etc.)
So basically, no, the PCs will not need to find it after it attacks them, unless it uses an action to Hide again.
For the party, there are :
Fighter 5 Human
Rogue 4 Fetchling darkvision
Ranger 5 Kobold darkvision hunter's aim (beacon shot)
Bard 2 kobold darkvision
Does a character with darkvision see automatically an undetected creature ?
For the Seek action, if a character look horizontally and success the perception check and a creature is on the ceiling, did it detect or not ?
If the character with a darkvision are in the radius of the light from a torch or a light spell, do it prevent the characters using their darkvision or not ?
The rules for Darkvision do not have being in an area of light as a restriction that prevents using darkvision.
So I would normally rule that darkvision works fine even if light is present.